https://doi.org/10.1351/goldbook.F02496
The term ) is used to describe the relative rates of two or more competing reactions on a may be defined in two ways. The first of these defines a fractional , for each product by the equation The second defines relative selectivities, , for each pair of products by In each case, and are the rates of increase of the and where and are the extents of reactions and respectively.
selectivity
(catalyst
. Such competition
includes cases of different reactants undergoing simultaneous reactions
or of a single reactant taking part in two or more reactions. For the latter case, selectivity
, extent of reactions
i and j respectively, i.e.